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Diagnose 2 or 3 stations "on"

My lakeside pump handles two neighbors and my sprinkler system.
Upon starting this year's season I noticed that all three systems are very erratic. I'll call them A, B, and C:
When A is on one or more stations in B are on. I didn'g check C.
when B is on at least one more station is on.
When C is on some stations nearly fail to come on; I didn't check but the implication is that water was going elswhere.
What could be the problem here?
Could marginal pump pressure affect solenoid operation?
Should solenoid housing be inundated with water?
should such water affect solenoid performance?
Are these valves repairable? Some are Irritrol 2400. Others look similar but lack the side gitzmo that says "on" and "off" and have a shiny 1/4" ss shown at top.
Would appreciate any comments

I've been been mulling this around in my mind for the last few days and can only offer this;
Check and make sure all the clocks fire at different times. (Unless the pump can handle the volume and pressure of water needed to run all 3 at once.) There's a chance all 3 clox are of the same Mfgr. and the elec service may have gone out, resetting them to safe mode.... all starting at the same time of day with the same back up program.
CAN or does the system have auto start ability? Might all 3 clox have a pump start/relay?
If you can override the pump and get it going, go thru' all the working zones of all 3 controllers and make sure they are up to snuff... THEN try to run 2, then 3 clox at once... you might find you don't really have a big problem. The pump might only be able to run one system at a time. If that's it, start the clocks at 8 hour intervals opposing one another.
Good Luck!,

The Irrigation Specialist Mfg' Az.
Please check my website and you'll find what I do and the unique tools I make and market.
Real timesavers, especially the Suck-Tube and Krik-It. http://www.tismaz.com